I have a friend, MrBorn, whom I think may have ADHD. Caffeine intensifies his existing obnoxious qualities so badly I don't want to be around him. He jitters and squirms constantly, blurts things out (often unkind), interrupts you constantly, can't stay on the same topic, and can talk 45 minutes without you saying anything - I've timed him!
I've heard that stimulants like caffeine can actually slow down an ADHD person. Does his hyper-reaction to caffeine mean he's probably not ADHD?